The manifold is used to split pump discharge into two separate lines. Whether it is a 2 or 3 line, this unit will reduce friction loss unlike the standard tee fitting. Kit Contains: 1 - 3 manifold, 3 - 2 reducers, 1 - 2 street 90 (elbow), 1 - 3 street 90 (elbow). Components are not glued together, allowing an array of possibilities. Browse through our TJB-INC Amazon Store for more Aquascape items.